"use strict";

var some = require("min-dash").some;

var ALLOWED_TYPES = {
  FailedJobRetryTimeCycle: [
    "bpmn:StartEvent",
    "bpmn:BoundaryEvent",
    "bpmn:IntermediateCatchEvent",
    "bpmn:Activity",
  ],
  Connector: ["bpmn:EndEvent", "bpmn:IntermediateThrowEvent"],
  Field: ["bpmn:EndEvent", "bpmn:IntermediateThrowEvent"],
};

function is(element, type) {
  return (
    element &&
    typeof element.$instanceOf === "function" &&
    element.$instanceOf(type)
  );
}

function exists(element) {
  return element && element.length;
}

function includesType(collection, type) {
  return (
    exists(collection) &&
    some(collection, function (element) {
      return is(element, type);
    })
  );
}

function anyType(element, types) {
  return some(types, function (type) {
    return is(element, type);
  });
}

function isAllowed(propName, propDescriptor, newElement) {
  var name = propDescriptor.name,
    types = ALLOWED_TYPES[name.replace(/flowable:/, "")];

  return name === propName && anyType(newElement, types);
}

function FlowableModdleExtension(eventBus) {
  eventBus.on(
    "property.clone",
    function (context) {
      var newElement = context.newElement,
        propDescriptor = context.propertyDescriptor;

      this.canCloneProperty(newElement, propDescriptor);
    },
    this
  );
}

FlowableModdleExtension.$inject = ["eventBus"];

FlowableModdleExtension.prototype.canCloneProperty = function (
  newElement,
  propDescriptor
) {
  if (
    isAllowed("flowable:FailedJobRetryTimeCycle", propDescriptor, newElement)
  ) {
    return (
      includesType(newElement.eventDefinitions, "bpmn:TimerEventDefinition") ||
      includesType(newElement.eventDefinitions, "bpmn:SignalEventDefinition") ||
      is(
        newElement.loopCharacteristics,
        "bpmn:MultiInstanceLoopCharacteristics"
      )
    );
  }

  if (isAllowed("flowable:Connector", propDescriptor, newElement)) {
    return includesType(
      newElement.eventDefinitions,
      "bpmn:MessageEventDefinition"
    );
  }

  if (isAllowed("flowable:Field", propDescriptor, newElement)) {
    return includesType(
      newElement.eventDefinitions,
      "bpmn:MessageEventDefinition"
    );
  }
};

module.exports = FlowableModdleExtension;
